Method for manufacturing copper-aluminum composite tube

Abstract

The invention relates to a method for manufacturing a copper-aluminum composite tube, and belongs to the technical field of manufacturing a metal composite tube. The method is characterized by comprising the following steps: A, preparing an inner tube and a covering belt, B. performing surface cleaning on the inner tube and the covering belt, C. covering the covering belt after surface cleaning on the surface of the inner tube after surface cleaning, performing vertical covering welding to manufacture a copper-aluminum composite tube blank, D. performing linear drawing on the copper-aluminum composite tube blank without strain furling, E. final annealing, and F. winding and furling to manufacture a finished product and other processing steps. The method can be used for manufacturing a copper-clad aluminum tube, an aluminum-clad copper tube and the copper-aluminum composite tube of which an inner layer and an outer layer are copper and the middle part is aluminum; and firm metallurgical bonding can be achieved between the copper and the aluminum.

Description

Technical field: [0001] The invention relates to a processing technology of a metal composite pipe, in particular to a processing method of a copper-aluminum composite pipe with a metallurgical bonding interface. Background technique: [0002] Such as figure 1 As shown, there are many forms of copper-aluminum composite pipes, generally in the following three ways: [0003] 1. Copper outside, aluminum inside, copper clad aluminum tube. [0004] 2. Aluminum outside, copper inside, aluminum clad copper tube. [0005] 3. Copper is inside and outside, aluminum is in the middle. [0006] Generally speaking, the composite tube with aluminum inside and outside and copper in the middle is not used in practice, because its performance is not much different from pure aluminum tubes, on the contrary, the processing cost is still high. Among them, copper-clad aluminum pipes can be used as air-conditioning pipes, connecting pipes, elbows, etc. It can also be used as the inner conduct...

AI Technical Summary

Problems solved by technology

However, due to the complex planetary rolling technology, the technology is difficult and the equipment is complicated. At the same time, due to the characteristics of the planetary rolling mill, it is impossible to roll super long tubes, and it is impossible to produce a particularly large single coil weight.

For example, the existing technology generally can only reach about 50kg / roll, and the low weight of a single roll will greatly reduce the efficiency of subsequent drawing, and will also reduce the yield of the product

In addition, this method is generally only capable of producing aluminum-clad copper tubes

[0012] Patent No. 200710110417.3 is to form a copper-clad aluminum tube by cladding welding, and perform random on-line annealing and post-pass stretching. However, due to the limited amount of reduction in a single pass of the stretching method, the bonding surface is not firm. Moreover, the traditional coiling makes the pipe wound on the disc body under the condition of great tension. This kind of force coiling will make the copper-aluminum joint surface tend to move with each other, thereby reducing the copper-aluminum bonding strength. The patent adopts the process steps of annealing first and then stretching, which has its inherent defects, because the copper-aluminum composite pipe will not produce a lot of hardening in the cladding welding step, and the real hardening occurs after drawing. The previous annealing does not have a good annealing and softening effect on the pipe

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